 /*******************************************************************************
  * Copyright (c) 2000, 2005 IBM Corporation and others.
  * All rights reserved. This program and the accompanying materials
  * are made available under the terms of the Eclipse Public License v1.0
  * which accompanies this distribution, and is available at
  * http://www.eclipse.org/legal/epl-v10.html
  *
  * Contributors:
  * IBM Corporation - initial API and implementation
  *******************************************************************************/
 package org.eclipse.core.internal.properties;

 /**
  * This type acts as a container for the results of
  * a query over the property store.
  * <p>
  * Where the results of a query are potentially spread across
  * multiple resources, the results are gathered together in a
  * single query results object.</p>
  *
  */
 import java.util.*;

 //
 public class QueryResults {
     protected HashMap table = new HashMap(10);

     public QueryResults() {
         super();
     }

     protected void add(ResourceName resourceName, Object value) {
         List properties = getResults(resourceName);
         if (properties.isEmpty())
             table.put(resourceName, properties);
         if (properties.indexOf(value) == -1)
             properties.add(value);
     }

     /**
      * Answers with an <code>Enumeration</code> of resources that comprise
      * the result.
      *
      * @return an <code>Enumeration</code> of <code>ResourceName</code>,
      * or an empty enumerator if there were no matching resources.
      */
     public Enumeration getResourceNames() {
         return Collections.enumeration(table.keySet());
     }

     /**
      * Returns all the results for a given resource.
      *
      * @param resourceName the resource for which the results are sought.
      * @return a <code>List</code> of the matching results. The <code>List</code>
      * will be empty if there are no matching results.
      */
     public List getResults(ResourceName resourceName) {
         List results = (List) table.get(resourceName);
         if (results == null)
             results = new ArrayList(10);
         return results;
     }
 }

